Higher vitamin D levels during pregnancy may lead to improved cognitive abilities in children years later. A major U.S. study suggests that early pregnancy is a crucial period for supporting brain development, particularly in children born to Black mothers.
Vitamin D levels in pregnancy play a key role in the well-being of both mother and baby. Beyond bone health, adequate vitamin D in pregnancy lowers risks of preeclampsia, gestational diabetes, low birth weight, and preterm birth.
Higher Maternal Vitamin D Linked to Better Childhood Cognitive Performance, NIH Study Finds
A recent study from the Environmental Influences on Child Health Outcomes (ECHO) Cohort—a nationwide research program funded by the U.S. NIH found higher maternal vitamin D linked to better cognitive scores in kids aged 7–12.
Lead author Melissa Melough, PhD, a registered dietitian and assistant professor at the University of Delaware, emphasized: “Our findings suggest early pregnancy may be a particularly important window for vitamin D to benefit brain development. This presents a valuable chance for healthcare providers to improve screening and promote vitamin D supplementation during this time.”
In this long-term observational study of 912 mother-child pairs, researchers assessed vitamin D status by measuring 25-hydroxyvitamin D (25(OH)D) levels in prenatal or umbilical cord blood, typically around the 23rd week of pregnancy. When the children were between 7 and 12 years old, they completed the NIH Toolbox Cognition Battery, which evaluates fluid cognition (problem-solving and reasoning), crystallized cognition (knowledge and learned skills), and overall cognitive function.
To account for possible confounding factors—such as maternal age, socioeconomic status, and other health variables—researchers applied statistical adjustments. They also examined differences by self-reported race and the timing of vitamin D exposure during pregnancy.
The recommended 25(OH)D range is 20–40 ng/mL. On average, participants had levels of 23.8 ng/mL, with 38% of mothers classified as vitamin D deficient (below 20 ng/mL). The study found that higher vitamin D levels during pregnancy correlated with stronger cognitive outcomes: a 10 ng/mL increase in vitamin D was linked to a 1.1-point rise in overall cognition and a 1.2-point rise in fluid cognition. No significant effect was observed for crystallized cognition.
Higher Early Vitamin D Tied to Bigger Cognitive Gains in Black Children
The study found a stronger link between maternal vitamin D levels and cognitive performance in children of Black mothers. For every 10 ng/mL increase in vitamin D, their children’s fluid cognition scores rose by nearly three points—compared to less than one point among children of non-Black mothers. Early pregnancy emerged as the most crucial window for this effect, with the clearest differences in vitamin D levels between higher- and lower-performing children observed during this stage.
These findings carry significant real-world implications. They underscore the vital role of vitamin D in fetal brain development and later cognitive ability. Since vitamin D deficiency is widespread—particularly among Black women, who are at greater risk due to reduced vitamin D synthesis from skin pigmentation—ensuring adequate levels before or early in pregnancy could help boost cognitive outcomes in children. From a public health standpoint, routine screening and supplementation may offer a low-cost strategy to support brain development, especially in vulnerable populations.
“Gestational 25(OH)D levels were positively linked to cognitive scores, especially in children of Black mothers,” the researchers noted. “Addressing deficiency before or in early pregnancy may be key to narrowing racial disparities in child neurodevelopment.”
Read the original article on: New Atlas
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